This study compares body composition characteristics with performance among participants in a 161-km trail ultramarathon. Height, mass, and percent body fat from bioimpedance spectroscopy were measured on 72 starters (17 women, 55 men). Correlation analyses were used to compare body characteristics with finish time, and unpaired t-tests were used to compare characteristics of finishers with non-finishers. Mean (±SD) BMI (kg*m-2) was 24.8±2.7 (range 19.1-32.2) for the men and 21.2±2.1 (range 18.1-26.7) for the women. Among the three fastest runners, BMI values range from 22.1 to 23.4 for men and 21.5 to 22.9 for women. Mean (±SD) percent body fat values for men and women were 17±5 (range 5-35) and 21±6 (range 10-29), and ranged from 6 to 14 and 14 to 27 among the fastest three men and women. There was a significant positive correlation (r2=0.23; p=0.0025) between percent body fat and finish time for men but not for women, and percent body fat values were lower for finishers than non-finishers for men (p=0.03) and women (p=0.04). We conclude that despite wide variations in BMI and percent body fat among ultramarathon participants, the faster men have lower percent body fat values than the slower men, and finishers have lower percent body fat values than non-finishers.

You may also be interested in a list of publications we have posted on the Western States Endurance Run website at http://ws100.com/research.htm <http://ws100.com/research.htm> (scroll to the bottom of the page). This list is from work performed at or supported by the Western States Endurance Run. Links to the abstracts are provided. I will be happy to send you the full paper - just email me.

We have several other papers in press and in various stages of review and preparation, so there will be more to come.